From 8200ec3ab061701ad504662490800549308faf87 Mon Sep 17 00:00:00 2001
From: davej <davej>
Date: Wed, 18 Dec 2002 13:42:11 +0000
Subject: new directory for benchmark type things

---
 bench/MHz.c     | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 bench/syscall.c |  33 ++++++++++++++++++
 2 files changed, 135 insertions(+)
 create mode 100644 bench/MHz.c
 create mode 100644 bench/syscall.c

(limited to 'bench')

diff --git a/bench/MHz.c b/bench/MHz.c
new file mode 100644
index 0000000..9391914
--- /dev/null
+++ b/bench/MHz.c
@@ -0,0 +1,102 @@
+/*
+ *  $Id: MHz.c,v 1.1 2002/12/18 13:42:12 davej Exp $
+ *  This file is part of x86info.
+ *  (C) 2001 Dave Jones.
+ *
+ *  Licensed under the terms of the GNU GPL License version 2.
+ *
+ * Estimate CPU MHz routine by Andrea Arcangeli <andrea@suse.de>
+ * Small changes by David Sterba <sterd9am@ss1000.ms.mff.cuni.cz>
+ *
+ */
+
+#include <stdio.h>
+#include <sys/time.h>
+#include <string.h>
+#include <unistd.h>
+
+#ifdef __WIN32__
+#include <windows.h>
+
+__inline__ unsigned long timer_init();
+#endif /* __WIN32__ */
+
+#include "../x86info.h"
+
+__inline__ unsigned long long int rdtsc()
+{
+	unsigned long long int x;
+	__asm__ volatile (".byte 0x0f, 0x31" : "=A" (x));
+	return x;
+}
+
+void estimate_MHz(int cpunum)
+{
+#ifndef __WIN32__
+	struct timezone tz;
+	struct timeval tvstart, tvstop;
+#endif /* __WIN32__ */
+	unsigned long long int cycles[2]; /* gotta be 64 bit */
+	unsigned long microseconds; /* total time taken */
+	unsigned long eax, ebx, ecx, edx;
+	double freq = 1.0f;
+
+#ifdef __WIN32__
+	LARGE_INTEGER lfreq;
+
+	QueryPerformanceFrequency(&lfreq);
+	freq = (double)lfreq.LowPart/1000000;
+#endif /* __WIN32__ */
+
+	/* Make sure we have a TSC (and hence RDTSC) */
+	cpuid (cpunum, 1, &eax, &ebx, &ecx, &edx);
+	if ((edx & (1<<4))==0) {
+		printf ("No TSC, MHz calculation cannot be performed.\n");
+		return;
+	}
+
+#ifdef __WIN32__
+	timer_init();
+	cycles[0] = rdtsc();
+	microseconds = timer_init();
+#else
+	memset(&tz, 0, sizeof(tz));
+
+	/* get this function in cached memory */
+	gettimeofday(&tvstart, &tz);
+	cycles[0] = rdtsc();
+	gettimeofday(&tvstart, &tz);
+#endif /* __WIN32__ */
+
+	/* we don't trust that this is any specific length of time */
+	usleep(250000);
+	
+#ifdef __WIN32__
+	timer_init();
+	cycles[1] = rdtsc();
+	microseconds = timer_init() - microseconds;
+
+#else
+	gettimeofday(&tvstop, &tz);
+	cycles[1] = rdtsc();
+	gettimeofday(&tvstop, &tz);
+
+	microseconds = ((tvstop.tv_sec-tvstart.tv_sec)*1000000) +
+		(tvstop.tv_usec-tvstart.tv_usec);
+#endif /* __WIN32__ */
+
+	printf("%.2f MHz processor (estimate).\n\n",
+		(float)(cycles[1]-cycles[0])/(microseconds/freq));
+}
+
+#ifdef __WIN32__
+__inline__ unsigned long timer_init()
+{
+	LARGE_INTEGER lcnt;
+
+	QueryPerformanceCounter(&lcnt);
+
+	return lcnt.LowPart;
+}
+#endif /* __WIN32__ */
+
diff --git a/bench/syscall.c b/bench/syscall.c
new file mode 100644
index 0000000..b271d70
--- /dev/null
+++ b/bench/syscall.c
@@ -0,0 +1,33 @@
+#include <time.h>
+#include <sys/time.h>
+#include <asm/unistd.h>
+#include <sys/stat.h>
+#include <stdio.h>
+
+#define rdtsc() ({ unsigned long a,d; asm volatile("rdtsc":"=a" (a), "=d" (d)); a; })
+
+int main()
+{
+	int i, ret;
+	unsigned long start, end;
+
+	start = rdtsc();
+	for (i = 0; i < 1000000; i++) {
+		asm volatile("call 0xfffff000"
+			:"=a" (ret)
+			:"0" (__NR_getppid));
+	}
+	end = rdtsc();
+	printf("%f cycles\n", (end - start) / 1000000.0);
+
+	start = rdtsc();
+	for (i = 0; i < 1000000; i++) {
+		asm volatile("int $0x80"
+			:"=a" (ret)
+			:"0" (__NR_getppid));
+	}
+	end = rdtsc();
+	printf("%f cycles\n", (end - start) / 1000000.0);
+}
+
+
-- 
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